> Op 13 juli 2016 om 11:51 schreef Ashley Merrick <ashley@xxxxxxxxxxxxxx>: > > > Okie perfect. > > May sound a random question, but what size would you recommend for the SATA-DOM, obviously I know standard OS space requirements, but will CEPH required much on the root OS of a OSD only node apart from standard logs. > 32GB should be sufficient, even with 16GB you should be OK. But I'd go with 32GB so you have enough space when you need to. Wido > ,Ashley > > -----Original Message----- > From: Wido den Hollander [mailto:wido@xxxxxxxx] > Sent: 13 July 2016 10:44 > To: Ashley Merrick <ashley@xxxxxxxxxxxxxx>; ceph-users@xxxxxxxxxxxxxx; Christian Balzer <chibi@xxxxxxx> > Subject: RE: SSD Journal > > > > Op 13 juli 2016 om 11:34 schreef Ashley Merrick <ashley@xxxxxxxxxxxxxx>: > > > > > > Hello, > > > > Looking at using 2 x 960GB SSD's (SM863) > > > > Reason for larger is I was thinking would be better off with them in Raid 1 so enough space for OS and all Journals. > > > > Instead am I better off using 2 x 200GB S3700's instead, with 5 disks per a SSD? > > > > Both the Samsung SM and Intel DC (3510/3710) SSDs are good. If you can, put the OS on it's own device. Maybe a SATA-DOM for example? > > Wido > > > Thanks, > > Ashley > > > > -----Original Message----- > > From: Christian Balzer [mailto:chibi@xxxxxxx] > > Sent: 13 July 2016 01:12 > > To: ceph-users@xxxxxxxxxxxxxx > > Cc: Wido den Hollander <wido@xxxxxxxx>; Ashley Merrick <ashley@xxxxxxxxxxxxxx> > > Subject: Re: SSD Journal > > > > > > Hello, > > > > On Tue, 12 Jul 2016 19:14:14 +0200 (CEST) Wido den Hollander wrote: > > > > > > > > > Op 12 juli 2016 om 15:31 schreef Ashley Merrick <ashley@xxxxxxxxxxxxxx>: > > > > > > > > > > > > Hello, > > > > > > > > Looking at final stages of planning / setup for a CEPH Cluster. > > > > > > > > Per a Storage node looking @ > > > > > > > > 2 x SSD OS / Journal > > > > 10 x SATA Disk > > > > > > > > Will have a small Raid 1 Partition for the OS, however not sure if best to do: > > > > > > > > 5 x Journal Per a SSD > > > > > > Best solution. Will give you the most performance for the OSDs. RAID-1 will just burn through cycles on the SSDs. > > > > > > SSDs don't fail that often. > > > > > What Wido wrote, but let us know what SSDs you're planning to use. > > > > Because the detailed version of that sentence should read: > > "Well known and tested DC level SSDs whose size/endurance levels are matched to the workload rarely fail, especially unexpected." > > > > > Wido > > > > > > > 10 x Journal on Raid 1 of two SSD's > > > > > > > > Is the "Performance" increase from splitting 5 Journal's on each SSD worth the "issue" caused when one SSD goes down? > > > > > > As always, assume at least a node being the failure domain you need to be able to handle. > > > > Christian > > > > > > Thanks, > > > > Ashley > > > > _______________________________________________ > > > > ceph-users mailing list > > > > ceph-users@xxxxxxxxxxxxxx > > > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > _______________________________________________ > > > ceph-users mailing list > > > ceph-users@xxxxxxxxxxxxxx > > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > > > > > -- > > Christian Balzer Network/Systems Engineer > > chibi@xxxxxxx Global OnLine Japan/Rakuten Communications > > http://www.gol.com/ _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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